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We have designed and experimentally demonstrated a radial and azimuthal polarization converter, which is a plasmonic metasurface with a radius of not more than 5 μm. The metasurface is composed of an array of metal-insulator-metal gap plasmon resonators, each of which reflects the incident local electric field to a predesignated polarization angle. The simulation results show effective polarization conversion within a broad band from 700 to 930 nm.
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Lei et al. (2017) studied this question.
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